Physics

Problem

A short light pulse enters a

2.0\,\text{cm}

-thick slab of acrylic (

n = 1.49

) from air and exits the far side. Approximately how much later does the pulse leave the acrylic slab than it would have taken to travel the same distance in vacuum? a)

6.7\,\text{ps}

99\,\text{ps}

33\,\text{ps}

3.3\,\text{ps}

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